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Carpentry Calculators

These carpentry calculators are online tools that you can use to simplify common construction tasks.  The calculators were designed with carpenters and builders in mind, but anyone can use them.  Most of the results are in decimal format, but many of them are in fraction format so that they are tape measure friendly.

Common Carpentry Calculators


Stair Calculator - used for calculating stair rise and run, stair rail angle, stringer length, and more.

Arch Calculator - calculate the focus point of an elipse, so that you can lay out the curve of an arch.

Roof Pitch Calculator - calculate roof pitch, slope, angle and rafter length of common rafters.

Cubic Yard Calculator - calculate volume in cubic yards and cubic feet. Use for calculating the yards of concrete needed for a patio slab or deck footing.




Math Calculators


The math calculators add additional functionality to the construction calculators above. 

Area Calculator - converts acres to square miles, to square feet, and to square yards.  It also does the reverse for each of the four area measurements.  It also provides the results in square meters and hectares.  This is a handy calculator when you need to convert large areas, like lots and acreage, into different area values.

Square Root Calculator - calculates the square root of a given number and provides results in both decimal and fraction format.  The fraction format makes this a useful calculator for carpentry projects.

Fraction Calculator - simply converts a decimal value to a fraction to the lowest common denominator. 




If one of these calculators doesn't fit your particular need, visit carpentry math to learn about some of the formulas used in carpentry.  In particular, understanding how the Pythagorean Theorem is used in calculating stairs, determining rafter pitch, and squaring walls, can be most valuable.

If you need to determine the span of a wood structural member, visit Span Tables for information on the allowable lengths of joists and rafters. The three tables available are; ceiling joist span table, floor joist span table, and rafter span table.


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